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The Globular Cluster System of NGC 5128: Ages, Metallicities, Kinematics and Structural Parameters

Published online by Cambridge University Press:  02 January 2013

K. A. Woodley  and
M. Gómez
K. A. Woodley*
Affiliation:
Department of Physics & Astronomy, McMaster University, Hamilton ON, L8S 4M1, Canada Department of Physics & Astronomy, University of British Columbia, Vancouver BC, V6T 1Z1, Canada
M. Gómez
Affiliation:
Departamento de Ciencias Fisicas, Facultad de Ingenieria, Universidad Andres Bello, Chile
*
DCorresponding author. Email: [email protected]
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Abstract

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We review our recent studies of the globular cluster system of NGC 5128. First, we have obtained low-resolution, high signal-to-noise spectroscopy of 72 globular clusters using Gemini-S/GMOS to obtain the ages, metallicities, and the level of alpha enrichment of the metal-poor and metal-rich globular cluster subpopulations. Second, we have explored the rotational signature and velocity dispersion of the galaxy's halo using over 560 globular clusters with radial velocity measurements. We have also compared the dependence of these properties on galactocentric distance and globular cluster age and metallicity. Using globular clusters as tracer objects, we have analyzed the mass, and mass-to-light ratio of NGC 5128. Last, we have measured the structural parameters, such as half-light radii, of over 570 globular clusters from a superb 1.2-square-degree Magellan/IMACS image. We will present the findings of these studies and discuss the connection to the formation and evolution of NGC 5128.

Keywords

galaxies: elliptical and lenticular, cDgalaxies: evolutiongalaxies: individual (NGC 5128)galaxies: star clustersglobular clusters: general
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 27 , Special Issue 4: The Many Faces of Centaurus A , 2010 , pp. 379 - 389
Copyright
Copyright © Astronomical Society of Australia 2010

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